He is accused of attacking a 93-year-old woman on Oct. 29, 2017, at the Parkview Elderly Assisted Living facility in Frisco.

The victim told police that a well-dressed man knocked on her door and said he was a maintenance worker. When she told him she didn't need any work done, he forced his way inside and knocked the woman from her walker to the floor.

The man grabbed a pillow from the couch and tried to smother her. The victim told police she "began to pray, believing she was about to die."

Jewelry was discovered missing from her apartment, and cell-phone records put Chemirmir in that location around the time of the attack. He was indicted on the attempted murder charge in May 2018.

Two months later, Chemirmir was indicted on another attempted murder charge. In that case, he is accused of assaulting a 91-year-old woman in her Plano apartment in March 2018. She told police a man put a pillow over her face, causing her to lose consciousness, and her jewelry had been stolen.

While investigating the Plano assault, police saw Chemirmir dump a jewelry box into a trash bin in Dallas. The box led police to the home of Harris, where she was found dead.

Plano Police Chief Gregory W. Rushin said at a news conference after Chemirmir's arrest that the man uses his "health care experience to his advantage, targeting and exploiting seniors."

"This is terribly disturbing," Rushin said at the time.

Authorities said at the time that they planned to review hundreds of unattended deaths of elderly women — including deaths that were previously ruled as resulting from natural causes — to determine whether they could be linked to Chemirmir.

In 2016, Chemirmir pretended to be an employee at the Edgemere Retirement Community in Dallas, according to court records. He used the alias Benjamin Koitaba.

Chemirmir's bail is now set at more than $9 million.

CLARIFICATION, 10:50 a.m., May 16: An earlier version of this article used the victims' dates of death from court records, but in some cases those dates didn't match when their families said they died. The story has been updated to make those distinctions.